Well, Jumbo is made thanks to special skin to 76mm sherman and only can work with it. From what i see the fire animation would still start at the ending of 76 mm gun.
I would love to see Jumbo in USF but they didn't want to add Hetzer tank destroyer (becouse of the fire animation) so i don't think they will add this one. It's a shame becouse this unit could acually add some character to the commander. Currently it has good abilities (especially for teamgames) but in my opinion it's more like a mix of diffrent slots than a doctrine that has a strong theme. Again, it doesn't mean they did a dead commander.
I guess you didn't read the last comment I added to the topic covering those concerns, I suggest you go see my answers and the video I showed of it even firing, proving wrong your assumptions that the round will spawn where it would normally on the 76 Sherman.
I might be wrong about it being poorly designed but until proven otherwise I stay besides my opinion that it will need a rework after release.
I always have Feuersturm equiped for urban maps, and I'd say it makes me win at least 75% (I'm rank 20ish with OKW randoms 3v3s) of matches on maps like Ettelbruk Station. The fact that it doesn't have anything shiny like a heavy tank or that it only works on certain maps doesn't mean it's a bad commander. Feuersturm is one of the most fun and best OKW commanders imo.
Oh goody, a commander that situationally performs well on a few maps with a lot of buildings, how nice.
We have truly reached the epitome of commander design in this game while in CoH it didn't matter most of the time about the map but more like what you preferred, what your teammates went and if you know how to play with a given command tree specilizating you in something.
Instead here we have (or had more like) Panic Pumas, tech skipping commanders, commanders that are good on the few maps with a lot of buildings, zerg rush tactics commanders and so on and so on instead of having a few but cohensive, well designed commanders that can fill a variety of roles as long as you know how to play them and they fit your style.
I would say that from the new commanders the only ones to follow their theme and actually be useful, spiritually like CoH, are the UKF Lend-Lease Assault and Ost Armor Reserves altho I think the Assault Panzergrenadiers would have fitted much better, the Assault Grenadiers were only added because they were badly designed and needed to be tweaked. Arguably the OKW commander is also nice but I don't like it's gimmicky MP40 upgrade. I won't mention the Soviet Airborne as I haven't played with it, meanwhile the USF commander looks like a bunch of abilities cubbled together just for the hell of it.